虹吸井对尾矿坝地震液化的影响分析
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摘要
为了解虹吸井对尾矿坝地震液化的影响,以东北地区弓长岭尾矿坝为例,通过在坝体施加虹吸井的方法进行动力计算,比较了排渗措施失效后与施加虹吸井后对坝体及库区液化区分布的影响,并通过有限元方法和拟静力法计算了坝坡的安全系数。结果表明,排渗措施失效后液化区主要分布于坝体溢出点以下区域及尾矿库库区内,坝体安全系数不符合规范要求,且尾矿坝不安全;施加虹吸井后液化区显著减小,仅分布于尾矿库库区内,库区水边线附近分布区域最大,且坝体安全系数能满足现行规范要求,尾矿坝安全稳定。
In order to understand the impact of the siphon wells on the tailings dam earthquake liquefaction,taking Gongchangling tailings dam in the northeast China for an example,dynamic calculation is implemented by the method of imposing siphon well on the dam.The effects of liquefaction area distribution of the dam and reservoir area after the failure of draining measures and application of the siphon well are compared.And the slope safety factor of the dam is calculated by using finite element method and quasi-static method.The results show that the primarily liquefied area is in the reservoir and the area below overflow point if the measures of draining leakage is failure;the dam safety factor does not meet the specification requirements and the tailings dam is not safe;after application of the siphon well,the liquefied area reduces significantly,which is only in the reservoir area;the region near water line is the maximum and the dam safety factor reaches the current specification requirements;the tailings dam is safety and stability.
In order to understand the impact of the siphon wells on the tailings dam earthquake liquefaction,taking Gongchangling tailings dam in the northeast China for an example,dynamic calculation is implemented by the method of imposing siphon well on the dam.The effects of liquefaction area distribution of the dam and reservoir area after the failure of draining measures and application of the siphon well are compared.And the slope safety factor of the dam is calculated by using finite element method and quasi-static method.The results show that the primarily liquefied area is in the reservoir and the area below overflow point if the measures of draining leakage is failure;the dam safety factor does not meet the specification requirements and the tailings dam is not safe;after application of the siphon well,the liquefied area reduces significantly,which is only in the reservoir area;the region near water line is the maximum and the dam safety factor reaches the current specification requirements;the tailings dam is safety and stability.
引文
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[13]迟世春.堆石坝坝坡的抗震稳定分析[J].世界地震工程,2002,18(4):11-17.
[14]中国水利水电科学研究院,电力工业部昆明勘测设计研究院,电力工业部西北勘测设计研究院,等.水工建筑物抗震设计规范(SL203-97)[S].北京:中国水利水电出版社,1997.
[2]梁亮,沈振中,王东,等.尾矿坝排渗墙渗流控制效果计算分析[J].水电能源科学,2011,29(4):89-91.
[3]张超,杨春和,白世伟.尾矿料的动力特性试验研究[J].岩土力学,2006,27(1):35-40.
[4]Seed H B,Martin G R,Lysmer L.The Generationand Dissipation of Pore Water Pressures during SoilLiquefaction,EERC75-26[R].Berkeley:Earth-quake Engineering Research Center of University ofCalifornia,1975.
[5]Dobry R,Powell D J,Yokel F Y,et al.Liquefac-tion Potential of Saturated Sand:The StiffnessMethod[A].Proceedings of Seventh World Confer-ence on Earthquake Engineering[C].Washington:Turkish National Committee on Earthquake Engi-neering,1980:25-32.
[6]徐志英.地震期孔隙水压力变化估算方法[J].水利学报,1981(4):68-73.
[7]吴远亮.尾矿坝的动力稳定性分析[D].西安:西安理工大学,2006.
[8]龚晓南.土塑性力学[M].杭州:浙江大学出版社,1999.
[9]王明洋,钱七虎.爆炸波作用下准饱和土的动力模型研究[J].岩土工程学报,1995,17(6):103-110.
[10]张超.尾矿动力特性及坝体稳定性分析[D].武汉:中国科学院武汉岩土力学研究所,2005.
[11]高开绪,胡冰,王树荣.土石坝地震动力及液化有限元分析的工程应用[J].山东水利,2009(8):17-19.
[12]顾淦臣,沈长松,岑威钧.土石坝地震工程学[M].北京:中国水利水电出版社,2009.
[13]迟世春.堆石坝坝坡的抗震稳定分析[J].世界地震工程,2002,18(4):11-17.
[14]中国水利水电科学研究院,电力工业部昆明勘测设计研究院,电力工业部西北勘测设计研究院,等.水工建筑物抗震设计规范(SL203-97)[S].北京:中国水利水电出版社,1997.
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